4 Functions, Financial
"The Sharp Elsi Mate El-1105 is of especial interst. It is apparently an accounting or financial speciality calculator. On the right side are two switches, the top one is an on and off switch, but the bottom switch allows the selection of the number of digits after a decimal point, from none to four, plus an "A" setting which I do not understand. It also has a special function key (MU.4%) which I understand it for calculating price mark ups. This calculator is not listed in the Ball and Flamm book nor in the web addendum. Any information you might have concerning it I would appreciate"
X-Number World of Calculators